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The flaws in Microsoft's software allow malicious code to be run on a vulnerable system

Users of Microsoft Internet Explorer have been urged to download a security patch to protect against three critical vulnerabilities in the software, including one that paved the way for the Scob Trojan horse (also known as Download.Ject or Toofer) in June.

Microsoft published the security update on its website on Friday 30 July.

"Normally Microsoft releases security fixes on a regular scheduled monthly basis, but the emergence of the Scob Trojan horse back in June has forced them to develop this fix and publish it on their website as soon as possible," said Graham Cluley, senior technology consultant for Sophos. "Companies and home users alike should ensure they are running the latest security patches to protect against these kinds of attacks."

"Home users might consider checking out the services Microsoft offers at windowsupdate.microsoft.com, which can scan your home PC for security vulnerabilities and suggest which critical patches need to be installed," continued Cluley.

About Sophos

More than 100 million users in 150 countries rely on Sophos as the best protection against complex threats and data loss. Sophos is committed to providing complete security solutions that are simple to deploy, manage, and use and that deliver the industry's lowest total cost of ownership. Sophos offers award-winning encryption, endpoint security, web, email, mobile and network security solutions backed by SophosLabs - a global network of threat intelligence centers.

Sophos is headquartered in Boston, US and Oxford, UK. More information is available at www.sophos.com.